/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         https://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/


#include "itkBinaryThresholdImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkVotingBinaryHoleFillingImageFilter.h"
#include "itkTextOutput.h"
#include "itkTestingMacros.h"


int
itkVotingBinaryHoleFillingImageFilterTest(int argc, char * argv[])
{

  if (argc != 3)
  {
    std::cerr << "Missing arguments" << std::endl;
    std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv) << " Inputimage OutputImage" << std::endl;
    return EXIT_FAILURE;
  }

  // Define the dimension of the images
  constexpr unsigned int Dimension = 2;

  // Declare the pixel types of the images
  using InputPixelType = unsigned short;
  using OutputPixelType = unsigned char;
  using InputImageType = itk::Image<InputPixelType, Dimension>;
  using OutputImageType = itk::Image<OutputPixelType, Dimension>;
  using ReaderType = itk::ImageFileReader<InputImageType>;
  using WriterType = itk::ImageFileWriter<OutputImageType>;

  auto reader = ReaderType::New();
  reader->SetFileName(argv[1]);

  ITK_TRY_EXPECT_NO_EXCEPTION(reader->Update());

  constexpr InputImageType::PixelType foreground = 97; // Prime numbers are good testers
  constexpr InputImageType::PixelType background = 29;

  const itk::BinaryThresholdImageFilter<InputImageType, InputImageType>::Pointer thresholder =
    itk::BinaryThresholdImageFilter<InputImageType, InputImageType>::New();

  thresholder->SetInput(reader->GetOutput());
  thresholder->SetLowerThreshold(30);
  thresholder->SetUpperThreshold(100);
  thresholder->SetInsideValue(foreground);
  thresholder->SetOutsideValue(background);

  // Define the voting binary hole filling filter
  using VotingBinaryHoleFillingImageFilterType =
    itk::VotingBinaryHoleFillingImageFilter<InputImageType, OutputImageType>;

  auto voting = VotingBinaryHoleFillingImageFilterType::New();

  ITK_EXERCISE_BASIC_OBJECT_METHODS(voting, VotingBinaryHoleFillingImageFilter, VotingBinaryImageFilter);

  // Define the neighborhood size used for the voting filter (3x3)
  InputImageType::SizeType neighRadius;
  neighRadius[0] = 1;
  neighRadius[1] = 1;
  voting->SetRadius(neighRadius);

  // Set the number of pixels over 50% that will tip the decision about
  // switching a pixel
  constexpr unsigned int majorityThreshold = 1;
  voting->SetMajorityThreshold(majorityThreshold);
  ITK_TEST_SET_GET_VALUE(majorityThreshold, voting->GetMajorityThreshold());

  voting->SetForegroundValue(foreground);
  voting->SetBackgroundValue(background);

  voting->SetInput(thresholder->GetOutput());

  // Execute the filter
  ITK_TRY_EXPECT_NO_EXCEPTION(voting->Update());


  std::cout << "Number of pixels changed: " << voting->GetNumberOfPixelsChanged() << std::endl;

  auto writer = WriterType::New();
  writer->SetInput(voting->GetOutput());
  writer->SetFileName(argv[2]);

  ITK_TRY_EXPECT_NO_EXCEPTION(writer->Update());


  std::cout << "Test finished" << std::endl;
  return EXIT_SUCCESS;
}
